# US 12,213,729 B2 · Catheter and recanalization catheter system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,213,729 B2 - Document ID: US12213729B2 - Status: Granted - Kind: B2 - Application number: 17/026,901 - Filed: 2020-09-21 - Published: 2021-02-25 - Granted: 2025-02-04 - Earliest claimed: 2018-03-29 - Assignees: Asahi Intecc Co., Ltd. - Applicants: Asahi Intecc Co., Ltd. - Inventors: Osamu Katoh; Wayne Ogata; Yukiko Hase; Kensuke Sakata; Takayuki Hori - Web page: https://patentgrep.com/patent/US12213729B2 ## CPC - A61B 8/12: in body cavities or body tracts, e.g. by using catheters - A61B 18/1492: {having a flexible, catheter-like structure, e.g. for heart ablation (A61B18/1477 takes precedence)} - A61B 6/12: Arrangements for detecting or locating foreign bodies - A61B 8/445: {Details of catheter construction} - A61B 18/042: {using additional gas becoming plasma} - A61M 25/0071: {Multiple separate lumens (multiple separate lumens throughout the catheter A61M25/0026)} - A61M 25/09: Guide wires - A61B 2017/22095: {accessing a blood vessel true lumen from the sub-intimal space} - A61B 2018/00077: {high, i.e. electrically conducting} - A61B 2018/00214: {Expandable means emitting energy, e.g. by elements carried thereon} - A61B 2018/00285: {Balloons} - A61B 2018/00577: {Ablation} - A61B 2018/00583: {Coblation, i.e. ablation using a cold plasma} - A61B 2018/00982: {combined with or comprising means for visual or photographic inspections inside the body, e.g. endoscopes} - A61B 2018/1467: {using more than two electrodes on a single probe} - A61M 2025/0197: {for creating an artificial passage within the body, e.g. in order to go around occlusions} - A61M 2025/09008: {having a balloon} - A61M 2205/3327: Measuring - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract A catheter comprises a shaft, an extended shaft portion, and an electrode disposed on an outer circumferential surface of the shaft. The shaft has a first lumen and a second lumen that is arranged adjacent to the first lumen. The extended shaft portion is provided on a distal end portion of the shaft, has the first lumen, and has a distal end portion located on a distal end side of a distal end portion of the second lumen, in the shaft. ## Claims ### Claim 1 A catheter comprising: an outer shaft; a first inner shaft having a first lumen; a second inner shaft having a second lumen arranged adjacent to the first lumen in a radial direction of the outer shaft, a plasma guide wire configured to be inserted into the second lumen and slidably disposed therein, and including a distal-end tip made of a metal material having electrical conductivity; wherein an extended shaft portion of the first inner shaft that is provided on a distal end side of a distal end face of the outer shaft extends in a longitudinal direction of the first inner shaft, the extended shaft portion including (i) the first lumen and (ii) a distal end portion located on a distal end side of a distal end portion of the second lumen; and an electrode disposed on an outer circumferential surface of the outer shaft, wherein the electrode generates plasma between the electrode and the distal-end tip of the plasma guide wire, and the surface area of the electrode is larger than the surface area of the distal-end tip of the plasma guide wire. ### Claim 2 (depends on 1) The catheter according to claim 1, wherein the extended shaft portion further comprises: a first opening formed in the distal end portion of the extended shaft portion, the first opening communicating with the first lumen; and a second opening formed on a proximal end side of the first opening in the extended shaft portion and in a side face of the extended shaft portion on a side opposed to the second lumen, the second opening communicating with the first lumen, and the second inner shaft comprises a third opening formed in the distal end portion of the second inner shaft, the third opening communicating with the second lumen. ### Claim 3 (depends on 2) The catheter according to claim 2, wherein the outer shaft further comprises a fourth opening formed in a side face of the outer shaft on a proximal end side of the third opening, the fourth opening communicating with the second lumen. ### Claim 4 (depends on 2) The catheter according to claim 2, further comprising an expanding/contracting portion disposed in the extended shaft portion, the expanding/contracting portion being configured to expand and contract in a radial direction of the extended shaft portion; and an actuating portion configured to expand and contract the expanding/contracting portion. ### Claim 5 (depends on 4) The catheter according to claim 4, wherein the expanding/contracting portion is made of a material having an acoustic impedance that is larger than an acoustic impedance of biological tissue. ### Claim 6 (depends on 4) The catheter according to claim 4, wherein the expanding/contracting portion is made of a radiopaque material. ### Claim 7 (depends on 2) The catheter according to claim 2, wherein the first lumen has a diameter that is larger than a diameter of the second lumen. ### Claim 8 (depends on 2) The catheter according to claim 2, further comprising a reinforcing member disposed in a thick wall portion of the outer shaft, wherein the reinforcing member is made of a material having electrical conductivity and is connected with the electrode so as to have electrical continuity with the electrode. ### Claim 9 (depends on 1) The catheter according to claim 1, further comprising an expanding/contracting portion disposed in the extended shaft portion, the expanding/contracting portion being configured to expand and contract in a radial direction of the extended shaft portion; and an actuating portion configured to expand and contract the expanding/contracting portion. ### Claim 10 (depends on 9) The catheter according to claim 9, wherein the expanding/contracting portion is made of a material having an acoustic impedance that is larger than an acoustic impedance of biological tissue. ### Claim 11 (depends on 9) The catheter according to claim 9, wherein the expanding/contracting portion is made of a radiopaque material. ### Claim 12 (depends on 1) The catheter according to claim 1, wherein the first lumen has a diameter that is larger than a diameter of the second lumen. ### Claim 13 (depends on 1) The catheter according to claim 1, further comprising a reinforcing member disposed in a thick wall portion of the outer shaft, wherein the reinforcing member is made of a material having electrical conductivity and is connected with the electrode so as to have electrical continuity with the electrode. ### Claim 14 (depends on 13) The catheter according to claim 13, wherein the reinforcing member is made of a radiopaque material. ### Claim 15 (depends on 1) A recanalization catheter system comprising: the catheter according to claim 1; and a sensor configured to obtain information for generation of an image of biological tissue, wherein the plasma guide wire is configured to perform ablation of the biological tissue by using the plasma. ### Claim 16 (depends on 15) The recanalization catheter system according to claim 15, wherein the sensor is configured to obtain the information in the first lumen, and the plasma guide wire is disposed in the second lumen such that a distal end portion of the plasma guide wire protrudes from a distal end of the second lumen, the plasma guide wire being configured to perform the ablation of the biological tissue by using the generated plasma. ### Claim 17 (depends on 1) The catheter according to claim 1, wherein the electrode is provided at a distal end of the outer shaft. ### Claim 18 A catheter comprising: a shaft having a first lumen and a second lumen arranged adjacent to the first lumen in a radial direction of the shaft; an extended shaft portion that is provided on a distal end portion of the shaft and extends in a longitudinal direction of the shaft, the extended shaft portion having the first lumen and a distal end portion located on a distal end side of a distal end portion of the second lumen in the shaft; a plasma guide wire configured to be inserted into the second lumen and slidably disposed therein, and including a distal-end tip made of a metal material having electrical conductivity; and an electrode disposed on an outer circumferential surface of the shaft, wherein the electrode is located on a proximal end side of the extended shaft portion and generates plasma between the electrode and a distal end portion of the plasma guide wire, and the surface area of the electrode is larger than the surface area of the distal-end tip of the plasma guide wire. ### Claim 19 A catheter comprising: a shaft having a first lumen and a second lumen arranged adjacent to the first lumen in a radial direction of the shaft, the shaft having an opening that is provided at a distal end of the shaft and communicates with the second lumen; an extended shaft portion that is provided on a distal end portion of the shaft and extends in a longitudinal direction of the shaft, the extended shaft portion having the first lumen and a distal end portion located on a distal end side of a distal end portion of the second lumen in the shaft; and an electrode located on a proximal end side of the extended shaft portion and disposed on an outer circumferential surface of the shaft, wherein the second lumen is configured such that a plasma guide wire is inserted into the second lumen and protrudes from the opening of the shaft, the first lumen of the extended shaft portion is configured such that a sensor is slidably movable in the first lumen of the extended shaft portion to obtain information for generation of an image of biological tissue of a target site, and the plasma guide wire includes a distal-end tip made of a metal material having electrical conductivity to generate plasma between the electrode and the distal-end tip to cause ablation of the target site. ### Claim 20 (depends on 19) The catheter according to claim 19, wherein the sensor is configured to obtain information for generation of an image of the plasma guide wire protruding from the opening of the shaft.